Method for switching over a gas turbine plant from gaseous fuel to liquid fuel and vice-versa
a gas turbine and liquid fuel technology, applied in the direction of machines/engines, mechanical equipment, light and heating apparatus, etc., can solve the problems of adversely affecting the final load, adversely affecting the life of the gas turbine, and the switch over of a sequential combustion gas turbine is a delicate and complicated operation, so as to reduce the risk of flashback at the second combustor, the effect of better control
Inactive Publication Date: 2016-09-20
ANSALDO ENERGIA IP UK LTD
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Benefits of technology
The technical effect of this patent is to reduce the number of actions required for fuel switching in a gas turbine plant, which helps to reduce temperature and load swings and increase the lifespan of the plant.
Problems solved by technology
Switching over a sequential combustion gas turbine is a very delicate and complicated operation, since modification of the operating conditions of one combustor influences the operating conditions of the other combustor and, in addition, the stringent restrictions imposed by the emission limits (CO, UHC, and NOx emissions), flame temperature, and flame stability must be respected.
Nevertheless, this traditional switch over method, that requires de-loading and re-loading of the gas turbine plant may adversely influence the final load, such as an electric generator, because during switch over no electric power or a reduced amount of electric power may be generated.
In addition, the large number of actions required for fuel switching over subjects the gas turbine plants (and in particular the first and second combustors) to temperature and load swings that adversely affect their lifetime.
Method used
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[0022]Methods embodying principles of the present invention may be implemented in gas turbine plants that have at least two combustors, a first combustor typically fed with compressed air and a fuel, and a second combustor fed with the flue gases from the first combustor and further fuel.
[0023]In this respect, a gas turbine plant useful for implementing embodiments of the invention may include a sequential combustion gas turbine unit or a first gas turbine unit that supplies its flue gases to a second gas turbine unit (in the latter case one or both the gas turbine units could also be sequential gas turbine units).
[0024]Exemplary methods for switching over a gas turbine plant from gaseous fuel to liquid fuel and vice-versa include sequentially switching over the first and the second combustor, while the other combustor maintains its operating conditions.
[0025]In other words, switch over is carried out in line.
[0026]In particular, while the first or second combustor is switched over,...
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In a method for switching over a gas turbine plant from gaseous fuel (16, 20) to liquid fuel (18, 22) and vice-versa, in which the gas turbine plant includes a first combustor and a second combustor fed with the flue gases of the first combustor, the first and second combustors are sequentially switched over while the other combustor maintains its operating conditions.
Description
[0001]This application claims priority to European application No. 09169610.4, filed 7 Sep. 2009, the entirety of which is incorporated by reference herein.BACKGROUND[0002]1. Field of Endeavor[0003]The present invention relates to a method for switching over a gas turbine plant from gaseous fuel to liquid fuel and vice-versa.[0004]In particular, methods embodying principles of the present invention may be implemented in gas turbine plants having at least two combustors, wherein the second combustor is fed with the flue gases from the first combustor.[0005]In this respect, for example the gas turbine plant for implementing a method of the present invention may include sequential combustion gas turbine units, i.e., gas turbine units having in series a compressor, a first combustor, a high pressure turbine, a second combustor fed with the flue gases of the first combustor, and a low pressure turbine.[0006]Alternatively, a method of the invention may also be implemented in gas turbine p...
Claims
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IPC IPC(8): F02C6/00F02C9/40F23R3/36
CPCF02C9/40F02C6/003F23R3/36F23R2900/03341
Inventor MEEUWISSEN, THIEMOKOKANOVIC, STANKASCHELL, SUSANNE
Owner ANSALDO ENERGIA IP UK LTD